It is highly unlikely that pears could cause constipation, and in fact they are likely to have the opposite effect. Due to the high amount of fiber that pears contain, they are sometimes used as a remedy for constipation.
An underwriter is a company or other entity that administers the public issuance and distribution of securities from a corporation or other issuing body.
Medical underwriting is a health insurance term referring to the use of medical or health information in the evaluation of an applicant for coverage, typically for life or health insurance.